Jennifer Aniston, Courteney Cox to Kiss on Dirt

Jennifer Aniston didn't have to kiss up to BFF Courteney Cox for a guest role on her FX drama Dirt. But she does have to kiss.

In the March 27 episode (filmed Jan. 18 and 19), Aniston gives Cox's tabloid editor Lucy Spiller a "goodbye peck," a source close to the show tells PEOPLE in its new issue. It's not the full-on makeout session that's been reported elsewhere, the source insists. "But, yes, it's on the lips."

Dirt producer Matthew Carnahan confirmed to USA Today that Aniston will play a lesbian on the show. (The story was first reported by TV Guide.)

Aniston will play Tina Harrod, a fellow magazine editor and bitter rival to Cox's character, Cox revealed this month at the Television Critics Association conference
in Pasadena, Calif. This is the first time the pair have been on a show together since Friends ended its run in 2004.

Cox later told PEOPLE she couldn't wait to start shooting: "We'll have a ball," she said. "We're just going to have fun."

On-screen lesbian kisses are nothing new for Aniston, at least, who once smooched Winona Ryder on Friends and shared a dance-floor kiss with Dagmara Dominczyk in the 2001 movie Rock Star.